Before a science can develop principles, it must possess concepts. Before a law of gravitation could be formulated, it was necessary to have the notions of "acceleration” and "weight.”. (Herbert Simon)

Before a science can develop principles, it must possess concepts. Before a law of gravitation could be formulated, it was necessary to have the notions of "acceleration” and "weight.”.

Herbert Simon

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acceleration gravitation law necessary science weight

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